To score good marks in AIIMS make sure your basics are clear. You can take help of NCERT books to build your concepts and make your fundamentals strong.

Below is the subject wise preparation

Physics- This subject tests your analytical skills. The physics questions in the AIIMS exam are advanced, but if your concepts are clear, then you can easily solved it. Practice as many Assertion & Reasons questions as you can.

Chemistry – In the past, most of the questions have been NCERT-based. Hence, refer to NCERT books for practice.

Biology – Follow NCERT & the Trueman’s series of books.

General Knowledge – You should read newspaper and magzines.

Good Luck!